Accounting machine



Dmn 24,1940. y A, E STURM 2,226,451

' ACCOUNTING MACHINE' Filed July l125, 4 Sheets-Sheet 1 Arme/vnf;

Dec. 24, 1940.

A, F. STURM ACCOUNTING MACHINE Filed July 25, 1936 4 Sheets-Sheet 2 Dee-24, 1940. A F, STURM '2,226,451

AcoUNT'ING MACHINE Dec. 24, 1940. lA. F. STURM ACCOUNTING momma lyl g5. 1936 za If 4 Sheets-Sheet 4 Filed Ju Patented Dec, 24, 1940 2 ,226,451

UNITED STATES PATENT OFFICE AocoUN'rmG MAonmE Ansgar F. Sturm, Staten Island, N. Y., assigner to Mergenthaler Linotype Company, a corporation of New York Application July 25, 1936, Serial No. 92,539

20 Claims. (Cl. 23S- 60) 'I'his invention relates to accounting machines showing certain details of the carrying mechaof the general organization disclosed in my Patnism looking at the parts from the front; ent No. 2,052,905, tiled July 29, 1932, and issued Fig. 6 is a view, similar to Fig. 4, but showing September 1, 1936 (of which the instant applicathe carrying mechanism during ja total transfer tion is a continuation inpart) wherein there are operation and just prior to a carrying operation 5 provided a plurality of accumulators capable in subtraction; upon selection, of independent association with a Fig. 7 isaI view similar to Fig. 4, but showing plurality of common actuating rack bars through the carrying mechanism just after a carrying which amounts may be entered into the accumuoperation in addition; y lators by addition or substraction, and through Fig. 8 is a view of a portion oi the carrying 10 which also accumulators may be selectively asmechanism, showing the location of the rack bars sociated with printing mechanism for printing after an operation in addition and where no amounts registered therein, and where there is carrying operation is to be effected; also provided means for transferring an amount Fig. 9 is a view of a portion of an accumulator registered in one accumulator to a second accuand its cooperating rack bars, a portion of the lli mulator by addition and to a third accumulator accumulator wheels and the rack bars being inr by subtractionin one cycle of operation oi the section; machine. Fig. 10 is a view similar to Fig. 6, but with the More particularly, the invention is directed to parts controlled fromv the keyboard instead of a carrying mechanism which is common to all of from an accumulator during a total transfer 20 the'accumulators, and which operates both for operation; and l addition and subtraction. The carrying mecha- Fig. 11 is a vertical transverse section on line nism operates through the actuating rack bars, Ii-II of Fig. 1. the bars being movable an additional space in The invention has been illustrated as applied 4 either direction, depending upon whether an adto the accounting machine disclosed in the Sturm 25 dition or a subtraction carry-over is required. In patent before alluded to, and to which reference some machines of this class, the 'actuating rack lmay be had for a more detailed description of the bars have a range of movement in one direction parts and the actuating mechanisms. only Jof nine spaces and'one additional space for Briefly, the machine includes a series of accucarrying, whereas in the instant machine, the mulators A, B, C,"-etc., arranged one behind the 30 y rack bars have a similar range of movement in other in tandem relation between side frames D both directions for the same purpose. fixed to the base plate ofthe machine (Figs. 1 As a result of this construction, the machine and 5), and which in their normal position are is capable of adding in one accumulator and subraised clear of a set of fore-and-aft reciprocable tracting in another accumulator in one cycle of rack bars E positioned directly therebeneath. 35 operation of the machine. Furthermore, it per- The accumulators consist each of a plurality of mits the use of accumulators having a single set rotatable digit wheels F (Figs. 1 and 9) mounted of digit wheels, engageable directly with the rack on a common shaft F1 and having their periphbars both for addition and subtraction, thus coneries divided into ten spaces, numbered respecserving space and affording a construction wheretively from 1 to 9 and zero, in a counterclockwise in the accumulatorsare visible to the operator. direction, looking at the machine from the right. o

Referring to the drawings: As shown best in Fig. 9, each digit Wheel F in- Fig. 1 is a longitudinal vertical section through cludes a pair of thin discs f secured at. its oppoan accounting machine employing the present site faces, and 8150 a small gear Wheel f4. by

5 improvements and with the parts in normal pomeans of which it is rotated. The disc f at the 5 sition; right is provided with an arresting tooth or tit Fig. 2 is a partial horizontal section on line f* for locating the digit wheel in the zero position, 2 2 of Fig. 1; and the other ldisc at the left with a correspond- Fig. 3 is a detail, showing certain operating ing tooth or tit f3 which controls the carrying 3 parts o! the carrying mechanism during one operation from one digit wheel to another. The 5o phase of operation; accumulators are equipped each with a pair of Fig. 4 is a partial longitudinal sectional view, selection keys (not shown), one for selecting an showing the carrying mechanism Just after a accumulator for operation in addition and the carrying operationl in subtraction; fother for selecting an accumulator for operation 5 Fig. -5 is a partial vertical transverse sectionf in subtraction, as well as with a total key for 55 clearingtheaccumulatorandprinting the amount registered therein. By depressing the subtraction key of a selected accumulator, the latter will, after a cycle of operation is inaugurated, be engaged with the underlying rack bars E of the actuating mechanism before they are moved rearwardly, to effect the subtraction operation; whereas, by depressing the add key of a selected accumulator, such accumulator will be engaged with the rack bars just before they start their return movement, to eie'ct an operation in addition; The selection keys and total key, just referred to, together with the mechanisms for effecting the operations indicated, are fully disclosed in the Sturm Patent No. 2,052,905, which is made a part hereof by reference.

' The rack bars E extend fore-and-aft of the machine and are displaced rearwardly and returned once during each machine cycle of operation. The distance through which the rack bars are displaced in/any cycle determines the extent of rotation of the accumulator wheels engaged therewith. The displacement oi.' the rack bars is controlled from a keyboard (not shown) having a set of ten digit keys, which are numbered 1 to 9 and zero, respectively, and when depressed raise corresponding stop fingers G of a stop carriage G1 into the path of the rack bars to limit their rearward movement (see Figs. 1 and 10). A more detailed description of the stop carriage may be found in my patent, previously alluded to.

The printing mechanism is arranged at the rear of the rack bars E and includes a set of vertical slides or type bars H which are movable individually upwardly and downwardly to locate one or another of a series of type elements H1 into and out of operative relation with a platen or printing roll H2. The upward movements of the bars H are effected by pull springs H3 and are controlled by the rearward movement of the rack bars E through intermediate gear sets H4 and a series of auxiliary rack bars H5 supported on xed transverse shafts H and H". If a main rack bar E is allowed to move, say eight spaces, into contact with the eight stop of the carriage Glpthe associated auxiliary bar Hs is caused to follow it by the pull of its associated spring H3, so that the vertical type bar H will rise a correfsponding number of spaces. Actually, the auxiliary rack bar H*s will move one space more than its associated rackbar E, in order to locate the first or zero type element H1 in active position. The additional space is required to allow the rack bars to move the extra space beyond normal position inthe return direction for carrying in addition. As far as the active spaces are concerned however, the movement of the bar H" will correspond to the movement of its assoe ciated rack bar E. The mechanism for setting the type bars H, under the control oi' the main rack bars E, is more fully described in my previously mentioned patent, to which reference may be had. y

After the type bars have been located in printing position, a series of hammer elements I will be moved'from the position shown insolid lines in Fig.v 1 to the position shown in dotted lines,

, wherein they cooperate with the type elements l in' printing position to print the number.

. The number registered in any accumulator may also be printed, inr which case, of course, lthe stop carriage will not be active. In printing Y from Aan accumulator, the litter is, upon selection by its total key, lowered into engagement with the rack bars E which will be moved rear wardly under the control of the accumulator until the latter registers aero, as determined by the engagement of the tit j* against a stop bai N when the accumulator wheels have reached the zero position, and this movement of the rack bars E will control the operation oi.' the printing bars H in the manner previously described.

The accumulator actuating mechanism i: common to all three accumulators, A, B and` C and is adapted to function at different .stages during each machine cycle to rotate the digli wheels of selected accumulators in one direction for addition and in the other direction for subtraction. This mechanism is supported between the upright side frames D and includes the series of main rack bars E which are equal in number to the digit wheels in each accumulator. As shown in Fig. 1, the rack bars are formed in their upper edges with a series oi teeth E1, and in their lower edges with a serie: of similar teeth E. At their front and real ends, the bars E are formed with slots El and E' (Fig. 7), by means of which they are suitably supported and guided on annularly grooved shafts Els and E. Near the front end, each racll bar is cut away, as at E', to provide clearance for the stop carriage Gl (Fig. 7), and at this end it terminates in a portion having three surface: e, e1, e2, the surface e being presented at the front end of the cut-away portion E" and adapted under certain conditions to engage one o1 another of the stops G (when raised) when the rack bar E is moved rearwardly so as to arrest the latter, the surfaces .e1 and ez being presented at the front end of each rack bar E for a purpose hereinafter to be described. The rack bars E, that is, all except the one at the extreme righi of the machine, are provided each with an arm K3 (Fig. 1) pivotally mounted on 4the rack bar adjacent the rear of the cut-away portion El and presenting, at its front end,.an interponeni K29 positioned adjacent and immediately at the rear of the surface e. 'Ihe dimension of the interponent in a direction lengthwise of the rack bar is equivalent to one space of movement oi the latter. When an item is entered in an accumulator by means of the keyboard, the rack bars are arrested in their rearward movement by the engagement of the interponents lwith the selected stops G, except when carrying in subtraction is required. When subtraction carrying from one order to the next higher order is necessary, the interponent associated with the rack bar of the latter order is raised, permitting such rack bar to move an additional space rearwardly or until the corresponding surface e engages the active Astop bar G. 'I'he manner of operation or the interponents will be described more in detail later on.

Each of the bars E as actuated by a set of reduction gears E and El, the gears E meshing with the teeth E? on the lower edge of the actuating bars, and the gears E' with a set oi subsidiary rack bars E, the latter, as shown in Fig. 1, being arranged below the bars E and mounted for a limited fore-and-aft movement. At their front ends, the racks E11 are guided in a fixed comb plate El extending transversely between the side frames, and at their rear ends l are supported upon a rod E, which is likewise "mounted in the side frames. Depending from the rear ends of the racks E are projections E14 to which are attachedv tension springs E" anchored at their front ends to a bar E" ex- Y movement and' are.loosely connected at their rear ends, as at E1', to a pair of vertically disposed actuating arms E1 depending from a rockshaft E111 which is controlled from the main shaft M of the machine. An additional sliding member E11 (Figs. 1 and 6) is connected to each of the subsidiary racks E11 by a pair of pin and slot connections e3. y

Both the racks E11 and sliding members E11 have projections W1 and ,15?3, respectively, which are connected together by strong pull springs EF. The movement of the auxiliary rack barsf E11 is controlled by a bail rod E, common to all of said bars and connected to the actuating arms E111 through the medium of angular supporting arms E, which receive lsupport from the sliding frame members E1'1 by means of pin and slot connections E1'I and IEW. According to this arrangement, when the parts are at rest, i. e., in their normal state, the rack bars E will at their front ends and at the surfaces e1, engage a bail J extending crosswise of the machine, being held resilintly in this position by the bail E25 acting through the sliding members E21, the springs E, the subsidiary rack bars E11, and the intermediate gears E1 and E111. v,

When the rock shaft E30 is turned in a clockwise direction to swing the arms E19 forwardly to the dotted line position shown in Fig. 1, the t'ension of the springs E is first neutralized and the springs E15 then placed under tension, so as to pull the subsidiary rack bars'E11 forwardly and,J through the gears E9 and E10, force the actuating rack bars E rearwardly until they are arrested by the engagement of the interponents K29 with the stops G in the carriage G1, or if an accumulator is engaged for totaling, by the tits f2 engaging the total stop bar N. 0n the other hand, when the rock shaft E10 is turned in a counterclockwise direction to swing the arms E19 rearwardly from the dotted line to the solid line position shown in Fig. 1, the bail rod E will, through its engagement with the sliding members E21, push the auxiliary bars E11 also rearwardly and finally, i. e. at the end-of the return stroke of the'arms E19, will stretch the springs E14. This rearward movement of the auxiliary rack bars E11 will, through the intermediate gear connections, move the main rack bars E forwardly and return them to normal position.

During the operation of the rack bars E, as just described. an accumulator selected forA subtraction will be engaged therewith and rotated thereby during the first phase of the machine cycle, i. e., when the rack bars E move rearwardly; whereas, an accumulator selected for addition will be engaged with the rackfbars and rotated thereby during the second phase of the machine cycle, i. e.,'whe,n the rack bars move for.- wardly to their normal positions. In performing these mathematical operations, it is yoften necessary to carry over from one digit wheel in an accumulator into another digit wheel, as for instance, when the addition voi several digits in one wheel exceeds nine, or when the digit of the subtrahend is greater than its corresponding digit in the minuend.- A carrying mechanism therefore, is provided, which, accordingto the present invention, is not 'only common to a" plurality of vsets of accumulators. but is also capable of effecting carrying both for addition and subtraction in selected accumulators in one cycle of operation of the'machine.

As before stated, the carrying operations in subtraction are adapted to take place at the end of the rearward movement of the rack bars E and, in addition, at the end of the return movement of said rack bars, carrying being eifected by providing for an additional movement of the rack bars in both directions, while the accumulator in which the carrying operation is to take place is still engaged.

Theseoperations, in the present instance, are accomplished through the medium of a set of links K extending in a direction fore-and-aft of the machine and arranged for operation by the vdigit wheels of the accumulators. The links K condition for operation a corresponding set of vertical slides K1 adapted to be raised and lowered twice during each cycle of the machine, namely, after the rearward movement of the rack bars E, and again after the return movement of the rack bars. The operation of a given slide K1, as determined by one digit wheel of an accumulator, will permit the rack bar E associated with the digit wheel of next higher order to move an additional space rearwardly or forwardly to effect carrying, depending upon whether the slide K1 is raised at the end of the advance stroke or during the return stroke of the rack bars E.

The links K (see Figs. l', 5 and 9) are arranged alongside the respective rack bars E and supported on shafts E11 `and Ea which extend transversely of the machine through curved slots K2 and K3 formed in said links. Each of the links K is provided at spaced intervals along its upper edge with lugs K5 (one for each accumulator), by, means of which it may be moved longitudinally in either direction and as permitted by the slots K1 and K3. These lugs in the normal position of the links are located directly below the axes of the respective accumulators A, B and C, so as to be disposed in the path of the tits or lugs ,f3 of the individual accumulator wheels when they are lowered into mesh with the teeth on the rack bars E, arid the angular position of the tits ,fs is `such that, when the accumulator wheels 1 cidental displacement (since their mounting is relatively sensitive vin order to be capable of operation by the accumulator wheels) by an equalizing member K0, common to all of the links andarranged between apair of vertical fingers K" rising from the upper edge of each of the links K near the front 'ends thereof.v When the equalizing member K11` is in its normal position, the

fingers K'l of the links K. Just prior to the rearward movement oftherack bars E, however, the equalizing vmember K1 is turned to the position shown in Eig. 3 to free the links K for movement by the engaged accumulator and just after the carrying operation at the end of the rearward" stroke. of the rack bars E has been completed, the member K1 is turned to normal position to restore the links K, and the same operations are lateral edges thereof engage the front and rear repeated just prior to and at the completion of the return movement of the rack bars E, the restoration of the links K being effected by the engagement of the equalizing member K with one or the other of the vertical fingers K1, according to the position of the links.

In order to effect the movement of the equalizing member K0, as just described, it is fastened at the left to a. hubmember Ka rotatably mounted in the side frame D, and at the right to a similar hub memberV K0, likewise rotatably mounted in the frame D (see Fig. The member K0 is operated by a gear segment K from an edge cam M1 keyed to the main shaft M of the machine (see Figs. 2 and 3). Motion from the main shaft M is imparted to the segment K10 through a bell crank lever K11 journalled on a fixed pivot K12 at the rear of the machine and an intermediate connecting link K11, the latter being provided near its front end with a short toothed portion K11 which meshes with the teeth on said segment'. The bell crank is provided with a cam follower K11i which is constrained to track along the cam M1 by a spring 1K1e secured at one end to said bell crank and anchored at its otherend in a fixed part of the machine, and which at the same time tends t0 urge the connecting link K13 to its forward position.

When the main shaft M is at rest, the cam follower K15 is engaged with a high portion M2 of the cam M1 and the link K13 is held rearwardly against the tension of the spring K10 to locate the equalizing member K0 in its normal position, wherein the links K are locked against movement (Fig. l). However, as soon as the cam shaft M starts to revolve in the direction as indicated Aby thearrow (the high portion M2 being comparatively short), the spring K1*1 is allowed to pull the link K13 forwardly and, through the gear segment K10, turn the equalizing bar K11 to the position shown in Fig. 3, wherein the carrying links K are freed for operation by the tits f1 on the accumulator wheels.

After the carrying operation on the advance or rearward stroke of the rack bars E has been completed, the cam follower K10 will engage a high portion M5 of the cam M1'and, through the intermediate devices previously mentioned. rotate the equalizing member K0 to its normal position,r thus restoring the links K. Immediately thereafter, and prior to the forward or return movement of the rack bars E, the roller K15 will ride oif the high portion M3 of the cam M1 again to rotate the equalizing member K0 and release the links K in order that the parts will be in condition for carryingon the return stroke or in addition, and again at the end oi the return stroke the links K will be restored to normal position as the roller K10 rides up on the high portion M2 of the cam M1.

The movement of the rack bars E the additional distance oi one space during both the advance as well as the return stroke in those denominations in which carrying is to-occur, is controlled from the vertical slides K1, which in turn are controlled by the slides K associated respectively with the digit wheels of next lower order and which determines whether ornot a carrying operation is to take place. c

The slides K1 are guided at their lower ends in a-fixed comb plate K1'I and are urged upwardly by springs K1a anchored at their upper ends to a iixed bar Kuand fastened at their lower ends to a series of arms L11l (corresponding in number to the slides K1) which engage at their upper edges against protrusions K10 with which the slides are equipped. The arms L1z are pivotal- 1y mounted at their front ends (Figs. 6 and 7) on a iixed cross bar L13 near the front of the machine and are guided in their movements by the comb plate K11 and at their front ends by an additional comb plate L1". The slides K1, at their upper ends, are slotted to engage in annular recesses of a vertically movable cross bar or bail K10 which holds the slides in a normal depressed position against the tension of the springs K10. The bail K10 is guided in the x'ed framework of the machine and is connected by links K01 and a pair of actuating arms K22 to the shaft E1, previously alluded to (see Fig. 3) The slides K1 are provided with opstanding projections K21 arranged directly beneath studs K* formed on the links K at their forward ends. Twice during each cycle of the machine, the bail K110 rises and, when it does so, the slides K1 would follow were it not for the fact that they are held downwardly by the studs K4 Aoverlying the projections K25, except in those denominations where the links K have been displaced either forwardly or rearwardly by therotation of their corresponding digit wheels from 9 to zero in addition or from zero .to 9 in subtraction. Where the slides K1 have been allowed to rise, they will permit an additional movement of one space of the rack bar E in the next higher denomination, rearwardly if the rise is at the end of the rearward stroke of the rack bars or forwardly if the rise is at the end of the return stroke of the rack bars.

The bail K10, and consequently the slides K1, are held in their lower positions (Fig. 1) by a segmental disc K21,vconcentric throughout a portion of its peripheral edge, and pinned to the hub member K1 (which operates the equalizing member K6, see Fig. 5) The disc K21 engages an antifriction roller K111 mounted at the side of one of the actuating arms K2?. As shown in Figs. v3 and 4, the disc K21 is formed in its outer edge with a depression or recess k which is adapted at two predetermined portions of each cycle of operation vand as permitted by corresponding low portions M4 and M5, formed in the cam M1, to be brought into registry with the roller K, in order to alloy:r the bail K to rise under the influence of a spring K33 connected to the actuating arm K21 and anchored in a fixed part of the machine (Fig. 3)

It will be noted that the depression M4 in the cam M1 is located just in advance of the high portion M3 thereof, which restores first the slides K1 and then the links K to normal position at the end of the rearward movement of the rack bars; also that the depression M5 in said cam is located in advance of the high portion M11 thereof which restores the slides K1 and the links K to normal position in the same sequence at the end of the return movement of the rack bars, and it is during the time that such low portions oi the cam M1 are active that the slides K1,

which have been freed ata result of thev dislcarrying in subtraction, is controlled from the slides K1 through the medium of a series of bell i crank levers L arranged beneath the rack bars the ilrst (see Figs. 1 and 7).

pivotally mounted on a cross shaft L1 extending` and provided one for each of said bars except The levers L are transversely between a pair of arms L1 pivotally mounted at their front ends on a ilxed cross shaft L3, the arms L1 being arranged ,one at each side of the machine and directly above the fore-and-aft frame members E1". 'I'he levers L are guided in a comb plate L4 extending transversely between the arms L1, and their degree of movement is limited to one space of the rack bars by slots L15 in the comb plate E111 which guides the subsidiary rack bars E11. The levers L are held in their normal position at 'the front ends of the slots L15 by a corresponding series of springs L' anchored at one endto depending lugs L" on the levers and at their other ends to a cross bar L*i extending between the arms L2 adjacent the rear ends thereof.

The arms L1 are provided each with an antifriction roller LP. and, when the. frame members E are actuated forwardly to effect the rearward movement of the rack bars E for subtraction, in the manner previously described, a pair of cam surfaces Ls formed in the upper edges of said frame members E1r will engage the anti-friction rollers L and swing the arms L2 upwardly, causing gear tooth-shaped projections L1 formed at the upper ends of the levers L to enter intoV one or another of the recesses between the teeth E1- formed in the bottom edges of their associated rack bars E (see Fig. 6). This engagement'of the carrying pawls L will Vtake place after the rack bars E have come to rest, the range of movement of the frame members E being considerably more than that-necessary to cause the rack bars E to traverse their full range of movement.

It will be understood that the force of the springs E15, tending to urge the rack bars E rearwardly, is more than sufficient to overcome the tension of the springs L acting on the carry- .ing pawls L, but the pawls L will prevent any rearward movement of the rack bars E when they are engaged therewith due to the fact that they are held in their forward positions in the slots L15 bythe arms L11 which in turn are held downwardly by the slides K1 and which have projections L11 at their ends normally overlying forwardly extending arms L1 with which the pawls are equipped (see Fig. 6). However, when a, slide K1 is raised as a result of the displacement of the link K which controlsl it, through the operation of the engaged accumulator, the arm L11 associated with such slide will likewise rise and, in doing so, will release its associated -pawl L, allowing the latter to rotate in a clockwise direction through a distance determined by the length of the slot L15 in the comb plate E11' and, as the pawl is engaged with the rack bar E of. next .higher order, said rack bar will move rearwardly through a distance of one space\ to complete the carrying operation.

Thereafter, the accumulator in which carrying has been effected is disengaged from the rack bars E and those'rackv bars, which were active in carrying, returned to the positions in which they were prior to carrying by the restoration of the slides K1 to normal position. Such operation will be vbrought about'by the arms L11 which i.

are depressed by the slides K1 and which in turn rotate Vthe pawls L in a counterclockwise direction until they are arrested by engaging at the front ends/of the slots L15. Since there was an overthrow movement ofthe frame members E".

rack bars.

to eect the engagement of the pawls L with the rack bars E, the ilrst part of the movement of the frame members E11 in the return direction, will allow the rollers L on the arms I..2 to ride of! the cam surfaces L5, thus allowing the pawls to be withdrawn out of engagement with the rack bars E. 4

If the rearward movement of the rack bars E is under the control of an accumulator, as in the case of a transfer operation, there is nothing to prevent the additional movement of the rack bars in carrying, since, as described in my Patent No. 2,052,905, previously mentioned, the accumulator from which an amount is transferred is disengaged from the rack bars prior to the disengagement of the accumulator into which the transfer is made. In the event the rearward movement of the rack bars E is controlled from the stop carriage G1 however, the movement oi an additional space to allow carrying in subtraction is permitted by the raising of the interponents K1. as previously stated (see Figs. 4 and These interponents are raised through the medium of the slides K1 which for this purpose are formed with elongated slots K14 to recive.

`the interponents K119 is such as to allow a movement of the rack bars of one space, they will, of course, be wide enough to permit the full range of movement of the pawls L (see Fig'. 4). It might be mentioned here that when a slide K1 is depressed to its normal position, the interponent will engage the underlying stop in the carriage, -but this will not interfere with the return of the slide K1 to normal position, since very slight pressure on the stops G will depress them to their normal positions in the carriage.

Prior to the return movement of the rack bars E, an accumulator is engaged for addition and the digit wheels thereof rotated in accordance with the extent of the return movement of the The bars however, will not be arrested4 in their normal positions at the end ofthe return stroke by the bail J, since prior thereto the bail J is moved forwardly to the position shown in Fig. 7, which is somewhat more than that necessary to permit the rack bars to move the extra space forwardly for carrying in ad-- quire carrying, the slides K1 controlled thereby will be released and, when` the bail K10 is raised, those slides which are free to move will rise to locate the lips K116 thereon in a position out of the path of the rack bars E, with the result that the corresponding rack bars are allowed to move forwardly one extra\space, as, determined by the engagement of the rack bars against thev cross bar E5 (see Fig. 7).

When carrying has been completed, the. accumulator is disengaged from the rack bars E and the latter thereafter restored to their normal' positions by the rearward movement of the bail J, the slides K1 are depressed by the bail K2", and the active links K camrned back into place by the rotation of the equalizing member K, these operations taking place in the order stated.

The bail J, as herein illustrated (see Figs. 3, 4 and 5) is supported by a plurality of arms J1 rising from a rock -shaft J2, and its movements are controlled from an edge cam M6 mounted on the main shaft M. 'I'he intermediate connections include a long fore-and-aft link J3 pivotally connected at its front end to an arm J4, likewise pinned to the rock shaft J2 at the left, and similarly connected at its rear end to one arm of a bell crank lever J5, `which is pivotally mounted on the studyK that carries the lever K11. A pull spring J6, attached to the link J", tends to swing the bail J forwardly and maintains an anti-friction roller J" carried by the other arm of the bell crank lever J5 constantly engaged with the cam M5. As shown in Fig. 3, the cam M9 is formed with a high portion M" and a low portion Ms and, when the anti--fric-y tion roller J" is opposite the high portion of the cam, the bail J, through the lever J5 and the link J3, will be retained in its rearward position, whereas when the roller J" `is opposite the low portion Ms of the cam, they bail J will move forwardly clear of the rack bars E, so that the latter will be free to move the additional space forward to effect carrying in addition, as previously described. When the roller J" again rides up on the high portion M" of the cam, the bail J will engage the surfaces e1 atthe front end 0f the rack bars and restore them to normal position. 1t will be observed that the rise in the cam M's occurs before the rise M2 in the cam M1, so that'the rack bars E will be restored by the bail before the slides K1 are depressed.

When the extent of rearward movement of the rack bars E is determined by an accumulator, as for instance, in transferring an amount from one accumulator to another, the rack bars, after the accumulator from which the amount is transferred and the pawls L are disengaged respectively from said rack bars in the manner previously described, would move rearwardly out of control, and the settings thus destroyed, so as to forbid transferring to another accumulator by addition in the second phase of the cycle" if some means were not provided to preventsuch occurrence. Such means in the present machine (see Fig. 1) include a series of pawls O pivotally mounted on a transverse shaft'Ol just above and to the lrear of the rack bars E when the latter are in their normal positions. 'I'he pawls (whichare the same inV number as the rack' bars) are normally held against the tension of individual springs Oz out of engagement with ratchet teeth e* with which the rack bars E are equipped at the top, by a' transverse Ibail O3 standing in front of upwardly projecting iingers O4 on said pawls and which is carried by.a pair of arms OB pivotallynnounted mounted one at each side of the machine on the fixed bar H which, it will-be recalled, supports the auxiliary rack bars H". The bail 0"in turn isheld in its normal position, wherein it retains the pawls O out of engagement with the rack bars by a stud 0 fixed in the link J3 and projecting in front of the arm O5 at the left of the machiney (see Figs. 1 and 1l). Immediately afterfthe carrying operation in subtraction occurs however, the roller fJ" rides o!! the high portion M" of the cam M6 and, as the link J3 moves to locate the bail J in its forward position, the arms Ols and the pawl retaining bail O3 will be free to move, allowing the pawls O to effect engagement with the ratchet teeth e4 on the rack bars E under the action of their associated springs O". The pawls O are maintained in their active positions during the restoration of those rack bars that have been active in subtraction carrying to the positions in which they were prior to such carrying and until after the rack bars E have started their forward or return movement. Since the setting of the rack bars is maintained in this way, the amount transferred to one accumulator during the first phase of the cycle by subtraction can be transferred during the second phase of the cycle to another accumulator by addition.

During the return movement of the rack bars, the pawls O will merely ride over the ratchet teeth e4 and will be returned to their normal positions out of engagement with the rack bars through the rearward movement of the link J3 when it actuates the bail J to return the rack bars to their normal positions after a carrying operation in addition. The restoring movement of the rack bars E is not prevented by the pawls O, since it will be noted that the terminal ratchet tooth on the respective rack bars registers with the corresponding -pawl when the rack bars are locatedin normal position.

In the accompanying drawings, the invention has been shown merely by way of example and in preferred form, and obviously, many variations and modifications may be made therein -which will still be comprised within its spirit. It is to be understood, therefore, that the invention lis not limited to any specific form or embodiment,

except insofar as such limitations are speciiied .in the appended claims.

.tuating means therefor, and carrying mechanism common to all of said accumulators and operative for both addition and subtraction duringone cycle of operation of the machine;

2. In a machine of the class described, the combination of a plurality of accumulators having each a single set of digit wheels, actuating means therefor comprising a single set of rackgbars engageable directly with the digit wheels of said accumulators for addition and subtraction, and carrying mechanism common to all of said accumulators.

3. In a machine of the class described, the combination of a plurality of accumulators, each' comprising a set of rotatable digit wheels, a single set of reciprocable fore-and-aft rack bars common to said accumulators and movable rearwardly and forwardly during each machine cycle of operation to rotate the wheels of selected accumulators' in opposite directions, and means common to corresponding digit wheels of said accumulators and controlled by the rotation thereof to eiect carrying for subtraction in one accumulator as the saidbars move in one direction, and to eiect carrying foraddition in another accumulator as the bars move in the opposite direction.

'4. In a machine of the class described, the comcomprising a set of rotatable digit wheels, means common to all of said accumulators for rotating the digit wheels thereof, and means common to said accumulators and controlled by the rotation of the digit wheels and operable during one phase of a machine cycle to effect carrying in one accumulator for addition, and operable during another phase of the same cycle to effect carrying in another accumulator for subtraction.

5. In a machine'of the class described, the combination of two accumulators, each comprising a set of rotatable digit-wheels and selectable one for addition and the other for subtraction, means vcommon to the accumulators for rotating the digit wheels, and common means operable during one machine cycle to effect carrying between adjacent wheels of both accumulators when thus selected. l

6 In a machine 0I the class described, the combination of a plurality of accumulators, each comprising a set of rotatable digit wh els and selectable each for an operation in add tion or subtraction, a set of reciprocable rack bars common l to the accumulators for rotating the digit wheels, f and carrying mechanism common to all of said g accumulators, said mechanism including means operable as the rack bars are moved in one directionto cause carrying between adjacent digit wheels of an accumulator selected for subtraction, and means operable as the said bars are moved in the opposite direction to cause carrying between adjacent digit wheels of another accumulator selected for addition.

'7. The combination as specied in claim 6, characterized by the fact that the carrying mechanism is effective for both the addition and the subtraction operations during one machine cycle.

8. In a machine of the c lass described, the combination of a plurality `of accumulators, each comprising a set of rotatable digit wheels, common actuating means with which said sets are selectively engageable and adapted during .one phase of a machine cycle to rotate the digit wheels thereof in one direction for addition and during a different phase of a machine cycle to rotate the digit wheels thereof in the opposite direction for subtraction, and means common to corresponding digit wheels of the different sets and operable by the wheels of the set engaged to effect a carry-over in addition or subtraction to the adjacent wheel of the said set, depending upon whether the set is engaged for addition or subtraction.

9. In a machine of the class described, the combination of a plurality of accumulators, each comprising a set of rotatable digit Wheels, common actuating means with which said sets are selectively engageable and adapted during one phase of a machine cycle to rotate the digit wheels in one direction for addition and during i another phase of a machine cycle to rotate the digit wheels in the opposite direction for subtraction, a common carrying mechanism for the sets functioning both during addition and subtraction, means associated with the digit wheels and operable thereby to control the carrying mechanism, and means for restoring the control mechanism after either an addition or a. subtraction carry-over. c

10. In a machine of the class described, the combination of an accumulator having a plurality. of rotatable digit wheels, actuating means therefor'includin-g a corresponding plurality of rack bars for moving the wheels in one direction foii addition and in the opposite direction for bar and operable upon the movement of 'the I control member associated with an adjacent digit wheel to augment the movement of its associated traction. v

11. In a machine of the class described, the combination of an accumulator having a plurality rack bar to effect a carry-over in addition or subof rotatable digit wheels, actuating means therement of the control member associated with anl adjacent digit wheel for operating the arresting devices to permit movement of the rackbar through an additional space in the same direction to permit a carry-over in addition or subtraction.

12. In a machine of the class described, the combination of a plurality of accumulators having ea'ch va set of rotatable digit wheels, common actuating means therefor includinga corresponding set of rack bars for rotating the wheels;

of the accumulators in one direction for addition and in the opposite direction for subtraction, means forarresting the rack'bars after a predetermined movement in one direction to enter an amount as represented by such movement into-l one accumulator, and mechanism operable to permit an additionall movement of the rack bars oi' one space in the same direction for carrying in saidaccumulator, a` set of elements associated one with each of the rack bars (except the first) and operable to restore the rack bars thathave been active in 'carrying to the position in which they were prior to carrying in order to enter the same amount in another accumulator upon movement of the rack bars in the opposite di-f rection, and operating means for said elements.

13. In a machine'of the class" described, the combination of a plurality of accumulators having each a set of rotatable digit wheels, common actuating means therefor including a corresponding set of rack bars for rotating the wheels of the accumulators in one direction for addition and in the opposite direction for subtraction, means for arresting the rack bars after 4a predetermined movement in one direction to enter an amount as represented by such movement into one accumulator, a corresponding set of ele` men'tsassociated one with each of the rack bars (except the first) and operable to permit an additional movement of the rack bars of one space in the same direction for carrying in said accumulator and to eifect a restoration oi.' the rack bars that have been active in carrying to the positions in which they were prior to carrying in order to enter the -same amount in another accumulator upon movement of the rack bars in the opposite direction, and operating means for said elements.

14. In a machine of the class described, the

`.combination of a plurality of accumulatore having each a set of rotatable digit wheels, lcommon actuating means therefor including a corresponding set of rack bars 'for rotating the wheels of the accumulators in one direction for addition and in the opposite direction for subtraction, means for arresting the rack bars after a predetermined movement in one direction to enter an amount as represented by such'movement into one accumulator, a corresponding set of elements associated one with each of the rack bars (except the iirst) and operable to permit an additional movement of the rack bars of one space in the same direction lfor carrying in said accumulator and to eiiect a restoration of the rack bars that have been active in carrying to the positions in which they were prior to carrying in order to enter the same amount in another accumulator upon movement of,the rack bars in the opposite direction, means controlled from the respective digit wheels of next lower order for effecting the operation of said elements in carrying, and means for operating said elements to restore the rack bars after carrying has occurred.

15. A combination according to claim 14, wherein the set of elements operable in carrying and in restoring the rack bars arecontrolled during both functions by the same devices.

16. In a machine of the class described, the combination of an accumulator having a plurality of rotatable digit wheels, actuating means therefor including a corresponding plurality of rack bars for moving the wheels in one direction for addition and in the opposite direction for subtraction, a control member associated'with each digit wheel and movable thereby in one direction i'or addition and another direction for subtraction, meansassociated with each rack bar and operable upon the movement of the control member associated with an adjacent digit wheel to augment the movement of its associated rack bar to effect carrying in addition or subtraction, and an equalizing member for restoring the control members to their medial positions. v

1'7. In a machine of the class described, the combination of a plurality of accumulators having each a set of rotatable digit wheels, common actuating means therefor including a corresponding set o1' rack bars for rotating the wheels of the accumulators in onedirection for addition and in the opposite direction for subtraction, means for arresting the rack bars after a predetermined movement in one direction, and means for retaining the setting of said rack bars as determined by such movement so as to' permit a corresponding movement of said rack bars in the opposite direction.

18. In a machine of the class described, the combination of .an accumulator having a plurality of rotatable digit wheels, a corresponding plurality of rack bars engageable therewith, actuating means operating through the rack bars for moving the digit wheels through a predetermined number of spaces in one direction for addition and through a predetermined number of spaces in the opposite direction for subtraction, devices associated with each rack bar and normally retaining said bar against further movement by the actuating means at the endof an operation in addition or subtraction, and control means operable by an adjacent digit wheel for rendering said devices operable to permit said actuating means to move the rack bar an additional space in either direction to eifect a carryover in addition or subtraction.

19. In a `machine of the class described, the combination of an accumulator having a plurality of rotatable digit wheelsI a corresponding plurality of rack bars engageable therewith, actuating means operating through the rack barsfor moving the digit wheels through a predetermined number of spaces in one direction for addition and through a predetermined number of spaces in the opposite direction for subtraction, devices associated with each rack bar and normally retaining said bar against further movement by the actuating means at the end of an operation in addition or subtraction, and a control member associated with each digit wheel and movable thereby in one direction for addition and in the opposite direction for subtraction and adapted lwhen operated to render the devices associated with the rack bar in an adjacent order operable to permit said actuating means to move said bar an additional space in either direction to eiect a carry-over in addition or subtraction.

20. In a machine of the class described, the combination of a plurality of accumulators, actuating means therefor movable during different phases of a machine cyclein different directions from and to normal position, and operable for addition when moving in one direction and for subtraction when moving in the other direction, and carrying mechanismI common to all of said accumulatorsand arranged to operate both for addition and subtraction.

ANSGAR F. STURM.

. CERTIFICATE CF CORRECTION. Patent No. 2,226,151; December 2h., 19H0.

ANSGAR F. STURII.

It is hereby certified that error appears in the printed specification of the above numbered patentrequiring correction as follows: Page 2, seoond column, line 6l, for "as" read is; page 5, first column, line 1LT: for "bail rod E" read--bail rod E25; page lq., second column, line 66, for: at read -as; page 8, first column, line 11.5, beginning with "In a machine" strike out all to and including the word and period `"direction." in second column, line 5, and insert instead the following as claim 17 Inamachine of the class described, the combination of'A an accumulator having a plurality of digit wheels rotatable in one direction for addition and in the opposite direction for subtraction, a corresponding set ofrack bars movable in opposite direcv tions for effecting addition and subtraction in said accumulator, a carrying mechanism operable through the rack bars both in addi- I tion and subtraction, actuating means for effecting the movement of the rack bars during carrying as well as during addition and subtraction, control members l associated one with each digit wheel and movable'/ thereby from an intermediate normal position, in one direction to condition the carrying mechanism for operation in addition. and in thel opposite direction to condition the carrying mechanism for operation in subtraction, and means for restoring the control members to-their'intermediate positions.

and that the said Letters lPatent should be read with this correction therein that tbe same may conformvto'- the record of the case in the Patent Office.

Signed and sealed this` lith dair Orf February, A. D. 19,41.

v Henry Van Arsdale (Seal) I Acting Commissioner of Patents.

CERTIFICATE oF CORRECTION. Patent No. 2,226,151; December 2li, 191m.

ANSGAR F. STURM.

It is hereby certified that error appears in the-printed specification of the above numbered patentrequiring correction as follows: Page 2, second column, line 6,1, for "as" read -is; page 5, first column, line 11.7, for "bail rod E" read-bail rod E25--5 page b., second column, line 66, for; at read -as`; page 8, first column, line h5, beginning with "In a machine strike out all to and including the word and period 4"directionJ in second column, line 5,v and insert instead the following Vas claim l? Inamachine of the class described, the combination of an accumulator having a plurality of digit wheels rotatable in one direction for addition and in the opposite direction for subtraction, a Corresponding set ofrack bars movable in opposite dire V tions forl effecting addition and subtraction in said accumulator,

a carrying mechanism operable through the rack bars both in addiv 4 tion and subtraction, actuating means for effecting the movement of the rack bars during carrying as well as during addition and subtraction, control members I associated one with each digit wheel and movable/v thereby; from an intermediate normal position, in one direction to Condition the carrying mechanism for operation in addition, and in the opposite direction to condition the carrying mechanism for operation in subtraction, and means for restoring the control members to-their'intermediate positions.

and that the said Letters lPatent should be read with this correction therein that the same may conformvto the record ofthe case in the Patent Office.

signed and Sealed this,A nth day of February, A. D. 19in.

i lHenry Van Arsdale,

(Seal) g I Acting Commissioner of Patents. 

